Genetic association of Gneiss, Plagiogneis and Granites in the “Agua Santa” formation, Isla de la Juventud
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Abstract
The Isla de la Juventud massif is represented by a terrigenous-carbonate, metamorphic and multideformed lithological complex from the Jurassic. The character of its regional metamorphism of pressure somewhat lower than that of the classic Barrovian type stands out. In this terrain there are several geological formations such as the Fm. Agua Santa of Middle Jurassic - Upper Jurassic (Oxfordian) age, in which it is intended to corroborate the genetic associations, the content and the statistical and geochemical behavior of the gneiss, plagiogneiss and granites. To determine these aspects, multivariate statistics were used with Pearson correlation indices and correlation dendrograms of variables and observations together with petrochemical analyzes of classification of geotectonic environments and discrimination of protoliths for the gneiss where they present an association with rocks related to a Continental volcanic arc magmatism, an environment that is not described with the Cretaceous Volcanic Arc and that initially differs from what was stated by Babushkin (1990). These samples have a 95 % correlation between them, possibly due to late episodes of magmatism that took place in the final stages of metamorphism of this terrain, so that this behavior of the larger oxides could be reflecting this contamination process suffered by the rocks in this context.
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